Add support for PostgreSQL authentication

[jumacabo]

What does this PR do?

Add support for PostgreSQL authentication, by adding 2 new parameters named auth-type and password to the following commands: postgres_database_list, postgres_table_list, postgres_database_query and postgres_table_schema_get.
Password parameter is optional an only required if we are using PostgreSQL authentication (MicrosoftEntra does not require it).

GitHub issue number?

#236

Pre-merge Checklist

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[Copilot]

Pull Request Overview

This PR adds support for password-based authentication in addition to the existing Entra ID authentication for PostgreSQL tools. The change allows users to connect to PostgreSQL servers using either authentication method based on the username format.

Key changes:

• Added optional password parameter to all PostgreSQL service methods and commands
• Modified authentication logic to use password authentication when username doesn't contain "@", otherwise uses Entra ID
• Updated all test mocks to include the new password parameter (passing null)

Reviewed Changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
IPostgresService.cs	Updated interface to add optional password parameter to all service methods
PostgresService.cs	Implemented conditional authentication logic based on username format; added password parameter to methods
BasePostgresOptions.cs	Added Password property to base options class
PostgresOptionDefinitions.cs	Defined new password option for CLI
BaseDatabaseCommand.cs	Registered password option and bound it in option parsing
DatabaseListCommand.cs	Added password option registration and binding
TableSchemaGetCommand.cs	Updated service call to pass password parameter
TableListCommand.cs	Updated service call to pass password parameter
DatabaseQueryCommand.cs	Updated service call to pass password parameter
TableSchemaGetCommandTests.cs	Updated test mocks to include null password parameter
TableListCommandTests.cs	Updated test mocks to include null password parameter
DatabaseQueryCommandTests.cs	Updated test mocks to include null password parameter
DatabaseListCommandTests.cs	Updated test mocks to include null password parameter
PostgresServiceParameterizedQueryTests.cs	Updated test method calls to include null password parameter

[JasonYeMSFT]

How does this change address the problem in the linked issue? In the linked issue, it says "This PostgreSQL server is configured with both PostgreSQL authentication and Microsoft Entra authentication methods." It doesn't seen that the root cause of the failure was missing PostgreSQL authentication support.

[xiangyan99]

How does this change address the problem in the linked issue? In the linked issue, it says "This PostgreSQL server is configured with both PostgreSQL authentication and Microsoft Entra authentication methods." It doesn't seen that the root cause of the failure was missing PostgreSQL authentication support.

w/o the change, we don't really use the password provided by user. We always useEntra ID.

[xiangyan99]

Please update changelog.